"My understanding from the Danish authorities is that already, even though a formal invitation has not yet been issued, 40 heads of state and government have indicated their intention to be present at the end of Copenhagen to celebrate success," de Boer said.

He said he was unable to immediately name the leaders, but described it as "really... a good spread" from rich and poor countries, and which had a wide variety of interests.

He noted that British Prime Minister Gordon Brown, French President Nicolas Sarkozy and Brazilian President Lula Inacio da Silva had already signalled their intention to come at the end of the December 7-18 conference.

De Boer, executive secretary of the UN Framework Convention on Climate Change (UNFCCC), said climate change was now firmly nailed to the agendas of the Group of Eight, Group of 20 and a forum of major economies that account for some 80 percent of the world's greenhouse-gas emissions.

"I have never before witnessed a moment in time when this issue has been so high on the agenda of world leaders," he told a press conference as senior officials ended five days of talks.

"We must capitalise on that in Copenhagen by inviting world leaders to give the Copenhagen outcome the final push and get us to a result."

The Copenhagen marathon is designed to climax a two-year process of negotiations leading to a worldwide agreement for tackling climate change beyond 2012.

The talks have been mired in discord over how to share out the burden for curbing greenhouse-gas pollutions and to prime a financial pump to help developing countries switch to a low-carbon technology and adapt to climate change.

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